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Predicted Time to Cleanup of MTBE In Well MW-9,Shell-Branded Service Station, 620 Charter Way, Stockton,California <br /> Concentration Trend Prediction <br /> Calculate"time to cleanup"given the first-order decay equation <br /> Days from Predicted <br /> y = b e" =a x=ln(ylb)!a Date First Sample Concentration(u gA) <br /> 5/29/2003 0 2 295 <br /> 5/28/2004 365 154 <br /> Given 5/28/2005 730 10 <br /> Water Quality Objective y 5 ug1L 5/28/2006 1 095 07 <br /> Constant b 22947 <br /> Constant a -00074 <br /> Date of first sample 5/29/2003 <br /> Calculate <br /> Days from first sample x 828 Days <br /> Years from first sample 2 3 Years Calculated Half Life= -In(2)/a <br /> Estimated date ofcleanup 1 94 Days <br /> 0 26 years <br /> Predicted Concentrations <br /> 10000 <br /> x � � <br /> 1000 <br /> F, 541., <br /> rT <br /> 100 Ui'i <br /> 10 <br /> C] 0 V3 V1 <br /> 0 o 0 o <br /> 0 0 0 a <br /> N N N N <br /> pegradation Rate Calculations As MW 9 MTBE Pred <br />